Methods used to determine preliminary estimates of expected values of incident costs are illustrated in a series of five tables. An introductory section presents brief explanations of how values in the tables are obtained. All estimates are based on an initial cost of construction of $40 per square foot of building floor space. Estimates are made according to incident state and building function, and by differentiating between costs to the owner, occupants, and the public. The first three tables present the mechanics of calculating the costs of restoring order, the costs due to building closure, and the average number of injuries and loss of life. Results of the calculations are summarized in another table. A final table gives estimates of the total expected incident costs for the Boston area, accounting for the mix of office buildings, apartments, and hospitals as determined from an inventory of high-rise buildings in Boston and Cambridge.